Defensive publication

ABSTRACT

A SUBSTANTIALLY COLORLESS CYCLOHEXANEDIMETHANOL SOLUTION IS PRODUCED BY DEPOLYMERIZING SCRAP POLYESTERS OF DIFUNCTIONAL GLYCOLS AND DIFUNCTIONAL AROMATIC DICARBOXYLIC ACIDS IN THE PRESENCE OF A C2 TO C8 ALIPHATIC ALCOHOL AT A TEMPERATURE OF AT LEAST ABOUT 125* C. SO AS TO OBTAIN A DEPOLYMERIZED REACTION PRODUCT COMPRISING A DIESTER, SUBJECTING THE DIESTER TO A FIRST CATALYTIC HYDROGENATION REACTION UNDER CONDITIONS SUFFICIENT TO SATURATE THE AROMATIC RING OF THE DIESTER, AND THEN SUBJECTING THE RESULTING DIESTER TO A SECOND CATALYTIC HYDROGENATION REACTION UNDER CONDITIONS SUFFICIENT TO REDUCE THE ESTER GROUPS AND TO PRODUCE THE SUBSTANTIALLY COLORLESS CYCLOHEXANEDIMETHANOL.

DEFENSIVE PUBLIGATIUN UNITED STATES PATENT OFFICE Published at the request of the applicant or owner in accordance with the Notice of Dec. 16, 1969, 869 O.G. 687. The abstracts of Defensive Publication applications are identified by distinctly numbered series and are arranged chronologically. The heading of each abstract indicates the number of pages of specification, including claims and sheets of drawings contained in the application as originally filed. The files of these applications are available to the public-for inspection and reproduction may be purchased for 30 cents a sheet.

Defensive Publication applications have not been examined as to the merits of alleged invention. The Patent Oflice makes no assertion as to the novelty of the disclosed subject matterl PUBLISHED MARCH 7, 1972 896 O.Gr. 16

T896,001 HIGH PURITY POLYESTER DEPOLYMERIZATION PRODUCTS FROM POLYESTER SCRAP BY COM- PLETE HYDROGENATION George Miller Stevenson, Kingsport, Tenn., assignor to Eastman Kodak Company, Rochester, NY. Continuation of application Ser. No. 676,724, Oct. 20, 1967. This application Nov. 24. 1969, Ser. No. 873,728 Int. Cl. C07c 35/02; C08g 17/08 US. Cl. 260-617(3 No Drawing. 15 Pages Specification A substantially colorless cyclohexanedimethanol solution is produced by depolymerizing scrap polyesters of difunctional glycols and difunctional aromatic dicarboxylic acids in the presence of a C to C3 aliphatic alcohol at a temperature of at least about 125 C. so as to obtain a. depolymerized reaction product comprising a diester, subjecting the diester to a first catalytic hydrogenation reaction under conditions sutficient to saturate the aromatic ring of the diester, and then subjecting the re sulting diester to a second catalytic hydrogenation reaction under conditions suflicient to reduce the ester groups and to produce the substantially colorless cyclohexanedimethanol. 

